Senior Software Engineer
Summary
Modernize legacy Java payment systems to Java 21+, improve reliability, and deploy on Kubernetes/AWS while ensuring compliance in a fintech environment.
- Lead modernization of legacy applications (Java 8 → Java 21+) to improve performance, maintainability, and compliance
- Enhance application hygiene, including testing, observability, and system reliability
- Implement and support containerized deployments using Kubernetes and cloud platforms (AWS preferred) Role Overview We are seeking experienced Senior Software Engineers to join a mission-critical payments modernization program. This role focuses on stabilizing, upgrading, and modernizing legacy systems rather than building new features. You will play a key role in elevating engineering standards, improving system resilience, and ensuring compliance across core financial systems. This is an opportunity to work on high-impact platforms in a lean, high-performing team, contributing as a hands-on engineer with strong ownership. Key Responsibilities
- Lead modernization of legacy applications (Java 8 → Java 21+) to improve performance, maintainability, and compliance
- Enhance application hygiene, including testing, observability, and system reliability
- Implement and support containerized deployments using Kubernetes and cloud platforms (AWS preferred)
- Work on mission-critical payment systems, ensuring stability and operational continuity
- Collaborate closely with engineering leads in pair programming and technical design sessions
- Identify and reduce technical debt across existing systems
- Contribute as an independent engineer in a lean team with minimal supervision
- Strong expertise in Java (preferably Java 21+) or Python
- Experience working with microservices and containerization (Kubernetes)
- Hands-on experience with AWS or similar cloud platforms
- Solid understanding of software engineering best practices (testing, CI/CD, observability)
- Experience in financial services, fintech, or payments systems
- Knowledge of payment processing (ACH, Swift, or similar) is highly desirable
- Proven ability to work on legacy systems with modernization goals
- Comfortable operating as a self-starter and individual contributor
- Strong problem-solving skills with a focus on system improvement rather than greenfield development
- Experience upgrading large-scale systems across Java versions
- Familiarity with compliance-driven environments (audit, regulatory frameworks)
- Exposure to observability tools and automated testing frameworks
- Prior experience in high-availability or mission-critical systems
- Engineers who thrive on improving and modernizing existing systems
- Individuals who can lead through expertise and initiative, not just follow requirements
- Team players who value clear communication and strong collaboration in lean teams
- Professionals who understand the realities and challenges of legacy system transformation